Figs. 2,037 to 2,041.—Various rotary converter and transformer connections. Fig. 2,037 two phase connections; fig. 2,038 three phase delta connections; fig. 2,039 three phase Y or star connections; fig. 2,040 six phase delta connections; fig. 2,041 six phase Y connections.
Ques. What is the relation between the impressed alternating pressure and the direct pressure at the commutator?
Ans. The ratio between the impressed alternating pressure and the direct current pressure given out is theoretically constant, therefore, the direct pressure will always be as 1 to .707 for single phase converters or if the pressure of the machine used above indicate 100 volts at the direct current end, it will indicate 70.7 volts at the alternating current side of the circuit.
Ques. Name two different classes of converter.
Ans. Single phase and polyphase.
Ques. What is the advantage of polyphase converters?
Ans. In the majority of cases two or three phase converters are used on account of economy of copper in the transmission line.
Ques. How is the armature of a polyphase converter connected?